Guard plate for a sash lock



FIG. 1 is a view in perspective of a guard plate for a sash lock showing my new design,

FIG. 2 is a top plan view thereof,

FIG. 3 is an end elevational view thereof, and,

FIG. 4 is a front elevational view thereof. 

The ornamental design for a guard plate for a sash lock, as shown. 